Abstract
Point-contact Andreev reflection (PCAR) measurements were made on bulk polycrystalline SrRu0.8Ti0.2O3 and SrRu0.92O3 samples to determine the transport spin polarization. The parent compound SrRuO3 undergoes ferromagnetic ordering at TC∼160K with relatively high spin polarization (∼60%). For the SrRu0.8Ti0.2O3 and SrRu0.92O3 samples, a reduction in TC occurs. Moreover, our measurements indicate that the SrRu0.8Ti0.2O3 system retains a high degree of spin polarization (P∼0.6), similar to the parent compound. However, due to the insulating nature of SrRu0.92O3, the PCAR technique did not yield information on P. Instead, the data displayed nonlinear I–V consistent with the tunnelinglike spectra.
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